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Steel Making

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





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Previous: Brown Automatic Signaling Pyrometer



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